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Driven oscillators at mili Kelvin temperatures

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Hi all,

I have modelled the resonance frequencies of a 3D silicon cantilever (140 x 5 x 0.1 um) with a magnetic sphere (NdFeB, 3.43 um diameter) attached at one of its ends, while I keep the other end fixed. I used physics: Solid Mechanics --> study: eigenfrequencies. See attachement for an impression.

The resonance frequencies correspond well with the resonance frequencies I found in my experiment.

I really would like to drive the cantilever now on one of its resonance frequencies and see what the actual displacement is of my cantilever. I know Q from experiment and I know the amplitude of the force (I drive the cantilever with a piezo element), but I am really struggling with implementing this in COMSOL… I even could not figure out which proper study I need for this problem (frequency domain, time dependent, etc?), I worked on this now for 2 days, no result…

Anyone experience with driving an oscillator in COMSOL? Any advice what to do would be welcome, I couldn’t find an answer on this forum/internet yet…

Thank you very much in advance!

1 Reply Last Post 19 sept. 2016, 04:18 UTC−4
Sarah Ji COMSOL Employee

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Posted: 8 years ago 19 sept. 2016, 04:18 UTC−4
Dear Karen,

You may refer to the example of Thickness Shear Mode Quartz Oscillator. I think it's quite similar to your case. Here is the model link:

www.comsol.com/model/thickness-shear-mode-quartz-oscillator-4707

Hope it helps.


Best
Sarah
Dear Karen, You may refer to the example of Thickness Shear Mode Quartz Oscillator. I think it's quite similar to your case. Here is the model link: https://www.comsol.com/model/thickness-shear-mode-quartz-oscillator-4707 Hope it helps. Best Sarah

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